Bookmarklet to take XKCD password - https://preshing.com/20110811/xkcd-password-generator/ - and turn it into caps, special chars (periods), and numbers.

xkcd_password_bookmarklet.js

(
    function() {
        function massage_xkcd(txt) {
            const arry = txt.split(' ');
            const randNum = String(Math.random()).slice(2, 5);
            const caps = arry.map(word => word.charAt(0).toUpperCase() + word.substring(1));
            caps.push(randNum);
            return caps.join('.');
        }

        const elt = document.getElementById('xkcd_pw_gen_result');
        const txt = elt.innerText;
        const passwd = massage_xkcd(txt);
        alert(passwd);
    }
)()

Revision 2 uses a much clearer way of generating 3 digits (with leading zeros if necessary):

String(Math.random()).slice(2, 5)

instead of the old opaque way:

Math.floor(Math.random()*(999-100+1)+100)